No-voltage release-switch



H. F. KRANTZ.

1N0 VOLTAGE RELEASE SWITCH.

APPLICATION FlLED DEC.26. I917.

Patented Dec. 6, 1921.

4 SHEETSSHEET I IIVVEIVTOR H. F. KRANTZ.

NO VOLTAGE RELEASE SWITCH.

APPLICATION FILED DEC.26, l9]?- Patented Dec. 6, 1921.

4 SHEETS-SHEET 2.

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N0 VOLTAGE RELEASE SWITCH.

APPLICATION FILED DE\J.26, 1917.

1,399,496 Patented Dec. 6, 1921.

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INVENTOR A; ATTUHWEY UNITED STATES PATENT OFFICE.

HUBER! I. KRANTZ, OF BROOKLYN, NEW YORK, ASSIGNOR TO KRANTZ MANUFAC-TUBING COMPANY INC., OF BROOKLYN, YORK, A CORPORATION OF NEW YORK.

N O-YOLTAGE RELEASE-SWITCH.

Specification of Letters Patent.

Patented Dec. 6, 1921.

Application filed December 26, 1917. Serial No. 208,798.

. lihood of injury to motors or other apparatus crgmected in thecircuit, is rendered impossi 1e.

A further object is to provide means whereby flow of current in athree-wire system will be automatically discontinued in case either oneof the three protecting fuses is blown. p

A more particular object is to provide means whereby the flow of currentwill be automatically discontinued coincident with the blowing of theneutral protecting fuse.

A further and more detailed object is to provide a controlling switchcommon to each of the three fuses, and to rovide means associated withthe fuses or causing off movement of said switch whenever either of thefuses is blown or otherwise disconnected.

Other objects and aims of the invention, more or less specific thanthose referred to above, will be in part obvious and in part pointed outin the course of the following description of the elements,combinations, arrangements-of parts and applications of principles,constituting the invention; and the scope of protection contemplatedwill be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of thisspecification, and in which I have shown merely a preferred form ofembodiment of the inventionz- Figure 1 is a vertical sectional viewthrough a switch box having its parts con-,

structed and arranged in accordance with this invention.

Fig. 2 is a horizontal sectional view taken ipbstantially upon the planeof line II of I ig. 1.

Fig. 3 is a front elevational view of the parts shown in Figs. 1 and 2,with the cover of the box removed, and

Figs. 4 and 5 are diagrammatic views illustratingdiiferent-position's-of the switch mechanism.

Referring to the drawings for describing in detail the structure whichis illustrated therein, the reference character L indicates a box orcasing within which all of the current-carrying and movableparts arelocated, said box preferably having a hinged cover 1 forming its frontwall. Within the casing is arranged a partition or barrier 2 ofinsulating material, said barrier being arranged substantially parallelwith the front and back walls of the casing'and dividing the interior ofthe casing into a rear or switch compartment 3, and a front' or fusecompartment 4. I h

Within the switch compartment 3 is arranged an insulated supportingplate 5 carrying the three main line contacts 6, .7 and 8, upon itsforward face. Three branch line contacts, 9, 10 and 11 are carried atthe rear face of the barrier 2 in positions diagonally opposite thecontacts 6, 7 and 8 respectively, and switch mechanism, as 12, ismounted intermediate said two sets of contacts adaptednto controlconnection therebetween at m The switch mechanism 12 includes a carrier13 that is pivot-ally mounted by its opposite ends, as 14 and 15, andwhich carries three insulated double-ended switch blades 16, 17 and 18.Turning of the carrier into on position places the blade-16 intoengagement with the contacts 6iand 9, the blade 17 into engagement withthecontacts 7 and 10, and the blade 18 into engagement with the contacts8 and 11. A spring 19 is arranged for urging the carrier at all timesinto ofi position.

A toggle, comprising the links 20 and 21, is arranged for swinging thecarrier against the tendency of the spring .19. When the toggle isbroken then the carrier stands in ofi' position, as shown in Fig. 4,whereto a position of accessibility exteriorly of the casing where itpreferably carries a handle grip 27 by means of which it may be swung tooperate the toggle.

The link 23 is provided with a longitu dinally extending slot 28 forengaging the pin 22 so as thus to provide for unobstructed snap movementof the toggle into its broken position when the lower end wall, as 29,is moved upwardly against the pin a sufficient distance to cause thelinks of the toggle to pass center.

A stop 30 is provided for limiting movement of the toggle links in onedirection so as thus to retain the toggle made. An extension arm 31 isalso provided upon the toggle link 20 and this arm projects into thepath of movement of the end 32 of a control lever 33 which is pivotallymounted upon the forward face-of the barrier 2, as at 34.

The reference characters G and H indicate-two solenoid coils arrangedside by side at the forward face of the barrier 2, within the fusecompartment. The cores, as 35 and 36 respectively, of these coilsproject downwardly from the coils and carry weights, as 37 and 38respectively, which stand above the lever 33. Each weight preferably hasan extension piece 39 which straddles the lever 33 and which provides anarcuate surface 40 arranged to engage the upper edge of the leverwhenever the weight descends.

The contacts 9, 10 and 11 are electrically connected through the barrer2 with fuse clips 41, 42 and 43 respectively which are arranged at theforward face of the barrier within the fuse compartment. Mating fuseclips 44, 45 and 46 are provided adjacent the clips 41, 42 and 43 forretaining the fuses 47, 48 and 49, in a well understood manner.

Main line wires as 50 extend into the free end of the casing and intoengagement with the contacts 6, 7 and 8, while branch line wires as 51extend-outwardly to the load (not shown) from the casing from the fuseclips 44, 45 and 46.

When the switch is on current, at one instant, may be assumed to feedfrom the contacts 6 and 8 tothe contacts 9 and 11, the fuse clips 41 and43 through the fuses 47 and 49, fuse clips 44 and 46 and outwardlythrough the branch line wires. At that same instant the current may beassumed to return throu h thefuse clip 45, the fuse 48, the fuse clip42, the contact 10 and the switch blade 17 to the main line contact 7.Shunt circuits extend from the fuse clip 44 along wire 52, throu h coilG, wire 53, wire 54 to fuse clip 45. lso from fuse clip 46, along wire55 though coil H and wire 54 to the fuse clip- 45. I So long as theswitch stands in the off position, as in Fig. 4, then the arm 31' of thetoggle stands free of the lever 33 but esa-see when the operating handle25 is operated to move the switch on, as in Fig. 5, then the arm 31moves downwardly from a position shown in full lines in Fig. 2 to aposition shown by the dotted lines in Fig. 2. Coincident with thedownward movement of the operating handle of course current is caused toflow through both of the coils G and H, thus lifting theweig'hts 37 and38 so that the lever 33 is free to move upwardly into the position shownby dotted lines in Fig. 3. This then is the normal operating position ofthe mechanism.

If now the fuse 47, for instance, should become destroyed, the circuitthrough said fuse and through the coil G will of course also bedestroyed and the coil G will become deenergize'd and allow the weight37 to fall upon the lever 33. This will move the lever into its fullline position, and will force the arm 31 upwardly a-sufiicient distance'to break the toggle, thus allowing the spring 19 to sna the switch off.On the other hand, if t e fuse 49 be destroyed the coil H will becomedead and the weight 38 will fall upon the arm 33 with the same result.Again, if the fuse 48 be destroyed, although a circuit through both ofthe coils will be maintained, by reason of the connecting wire 53, yetthe current passing will be insufficient to hold the weight 38 elevated,this due to the fact that the weight 38 is made of such increased sizeand weight relatively to the weight 37, as to be too great to besupported by the divided current. The weight 38, therefore, will falland throw the switch off in the same manner as described with referenceto the other fuses.

As many changes could be made in this construction without departingfrom the scope of the invention as defined in the following claims, itis intended that all matter contained in the above description or shownin the accompanying drawings, shall be interpreted as illustrative onlyand not in a limiting sense.

What I claim is:

1. The combination with a three-pole switch, and means for opening the.switch, of two trip coils connected across the respective poles of theswitch, and two movable core members therefor having different weights,the core members being of such weights that they engage the said meansto open the switch when no current traverses the trip coils and when thetrip coils are connected in series across the two poles of the switch.

2. Switch mechanism comprising a threepole switch, a pair ofelectro-magnets so connected across the poles of the switch that theyoperate in series on current flowing from one pole to another and inparallel on current flowing from the third pole to the respectivefirst-mentioned poles, a trip bar for moving the switch to openposition, and a movable core for each electro-magnet having differentweights adapted to engage the bar and move the switch to open positionwhen the energization of the electro-magnets is insufficient to sustainthem out of operative relation with the bar.

3. The combination with a threeole switch having a pivoted operating memer, of a pair of core members of different wei hts for engaging theoperating member at iiferent distances from the pivot therefor, theheavier member being disposed nearer to the pivot than the lightermember, and a tripping coil for each core member pole of the switch thatinterruption of current through either pole of the switch will causesufliclent reduction of current through one coil to permit the coremember thereof to drop into actuating engagement with the operatingmember.

In testimony whereof I afiix my signature in the presence of twowitnesses.

HUBERT F. KRANTZ'.

Witnesses:

JOHN L. Kome, C. S. Donm.

